PROCESS FOR THE MANUFACTURE OF A TRICYCLIC COMPOUND
申请人:PFIZER INC.
公开号:EP0680482B1
公开(公告)日:1997-04-02
US5892040A
申请人:——
公开号:US5892040A
公开(公告)日:1999-04-06
Process for the manufacture of a tricyclic compound
申请人:Pfizer. Inc
公开号:US05892040A1
公开(公告)日:1999-04-06
A process for preparing a compound of formula (I) or a phamaceutically-acceptable salt thereof, comprising: 1) reacting a compound. of formula (III), in which R is a straight or branched chain alkyl having from one to four carbon atoms, with an alkali metal hydroxide in an aqueous medium at a temperature of about 80.degree. to 120.degree. C. and time of about 20 to 100 hours to form a reaction product; 2) cyclizing the reaction product of step 1) with formic acid and formaldehyde to form a formiate compound; and 3) neutralizing the formiate compound of step 2) with an aqueous base.